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[209.132.180.67]) by mx.google.com with ESMTP id f9si15544053pgc.510.2019.07.15.01.52.56; Mon, 15 Jul 2019 01:53:15 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729452AbfGOIwX (ORCPT + 99 others); Mon, 15 Jul 2019 04:52:23 -0400 Received: from mx3.molgen.mpg.de ([141.14.17.11]:46437 "EHLO mx1.molgen.mpg.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729289AbfGOIwX (ORCPT ); Mon, 15 Jul 2019 04:52:23 -0400 Received: from rabammel.molgen.mpg.de (rabammel.molgen.mpg.de [141.14.30.220]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pmenzel) by mx.molgen.mpg.de (Postfix) with ESMTPSA id 2352920669593; Mon, 15 Jul 2019 10:52:20 +0200 (CEST) Subject: Re: [Intel-wired-lan] [PATCH] e1000e: Make speed detection on hotplugging cable more reliable To: Kai-Heng Feng Cc: Jeff Kirsher , netdev@vger.kernel.org, intel-wired-lan@lists.osuosl.org, linux-kernel@vger.kernel.org References: <20190715084355.9962-1-kai.heng.feng@canonical.com> From: Paul Menzel Message-ID: <017771d5-f168-493a-46a1-88e513941ba1@molgen.mpg.de> Date: Mon, 15 Jul 2019 10:52:19 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <20190715084355.9962-1-kai.heng.feng@canonical.com> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms030007020601070801060400" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms030007020601070801060400 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Dear Kai-Heng, Thank you for the patch. On 7/15/19 10:43 AM, Kai-Heng Feng wrote: > After hotplugging an 1Gbps ethernet cable with 1Gbps link partner, the > MII_BMSR may reports 10Mbps, renders the network rather slow. s/may reports/may report/ s/renders/rendering/ > The issue has much lower fail rate after commit 59653e6497d1 ("e1000e: > Make watchdog use delayed work"), which esssentially introduces some essentially > delay before running the watchdog task. >=20 > But there's still a chance that the hotplugging event and the queued > watchdog task gets run at the same time, then the original issue can be= > observed once again. >=20 > So let's use mod_delayed_work() to add a deterministic 1 second delay > before running watchdog task, after an interrupt. I am not clear about the effects for the user. Could you elaborate please? Does the link now come up up to one second later? > Signed-off-by: Kai-Heng Feng Any bug URL? > --- > drivers/net/ethernet/intel/e1000e/netdev.c | 12 ++++++------ > 1 file changed, 6 insertions(+), 6 deletions(-) Kind regards, Paul --------------ms030007020601070801060400 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCC EFowggUSMIID+qADAgECAgkA4wvV+K8l2YEwDQYJKoZIhvcNAQELBQAwgYIxCzAJBgNVBAYT AkRFMSswKQYDVQQKDCJULVN5c3RlbXMgRW50ZXJwcmlzZSBTZXJ2aWNlcyBHbWJIMR8wHQYD VQQLDBZULVN5c3RlbXMgVHJ1c3QgQ2VudGVyMSUwIwYDVQQDDBxULVRlbGVTZWMgR2xvYmFs Um9vdCBDbGFzcyAyMB4XDTE2MDIyMjEzMzgyMloXDTMxMDIyMjIzNTk1OVowgZUxCzAJBgNV BAYTAkRFMUUwQwYDVQQKEzxWZXJlaW4genVyIEZvZXJkZXJ1bmcgZWluZXMgRGV1dHNjaGVu IEZvcnNjaHVuZ3NuZXR6ZXMgZS4gVi4xEDAOBgNVBAsTB0RGTi1QS0kxLTArBgNVBAMTJERG 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